PRODUCTION ENGINEERING MEASURE, CR-(XM45)/U QUARTZ CRYSTAL UNITS (RUGGEDIZED, LOW-FREQUENCY).
Abstract
The CR-(XM-45)/U quartz crystal units are in the 90-Kc to 200-Kc frequency range. They are similar to the military-type CR-42A/U units of specification MIL-C-3098, but are required to withstand severe vibration: 10 to 2,000 cps vibration at 15-g acceleration. These units, as developed, use 'double-rotated X-cut' resonators (dimensions and orientation similar to wide-plate NT's, but with full electrodes to excite length-width modes; the crystals are mounted by double sets of headed wires in a shock-resistant, ceramic-frame mounting. They are sealed in vacuum, in HC-13/U holders. The CR-(XM-45)/U was to provide improved temperature-frequency stability, lower resistance, and greatly improved ability to withstand severe vibration, as compared to the CR-42A units. However, it was found that the design features necessary for ruggedization imposed definite penalties: capacitance and resistance limitations had to be relaxed, and the temperature-frequency stability had to be returned to the regular CR-42A level.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1964
- Accession Number
- AD0613188
Entities
People
- A. R. Krespan
- J. M. Wolfskill
- Robert Mouck